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Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Short-term investments	$ 5,087	$ 5,798
Marketable equity securities	1,307	1,620
Vendetta warrants	3	49
Level 1
Assets
Short-term investments	5,087	5,798
Marketable equity securities	1,307	1,620
Vendetta warrants	0	0
Level 2
Assets
Short-term investments	0	0
Marketable equity securities	0	0
Vendetta warrants	3	49
Level 3
Assets
Short-term investments	0	0
Marketable equity securities	0	0
Vendetta warrants	$ 0	$ 0

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The fair value as of the balance sheet date of firm holdings in corporate stocks (common and preferred), stock options, warrants and any other financial instrument which represents, or provides the ability to obtain, ownership rights in a corporation. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Amount of investment in marketable security.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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